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106. COMPOSITIONS,

COATING 0R PLASTIC Qross Reference UNITED ATES mm OFFICE? txam: 8!

HARVEY :e. BOOTH, oEiroNirEEAL, QUEBEC, C ADA, AssieNon roAIn msAY ANn' SON COMPANY, OF moN'rnEAL, QUEBEC, CANADA, A CORPORATION.

Patented Nov. 11, 1919.

1,321,035, Specification of Letters Patent.

No Drawing. Application filed November 18, 1918. Serial No. 262,985.

To all whom it man concern:

Be it known that I, HARVEY BRADBURY duced by a mixture containing the minimum quantity of feldspar as follows:

I do hereby, declare that the followmg 1s a With a l ti comprising di ilifull, clear, and exact description of same.

This invention relates to refractory cements and its object is to provide a cement composition more particularly adapted for use as a p Y 0. Q: for the electrodes of electirc furnaces although it may be used for a variety of purposes.

Hitherto in applying protective coatlngs to electrodes it has been necessary to first wind the electrode with wire in order to cate (92 parts), sodium su ate parts) and water 30 For an electrode supplying a heat of say 1500 degrees Fahr. the following mixture would be effective:

. Per

cent. Feldspar", 440 Silica"; 20 Silica sand 15 afford a frictional surface to insure adhesion With a Solution of sodium silicate and a solution refgralgly of sodium silicate,

sodium sulfate and water.

11' preparing e cem or use as a protective coating for electrodes the portlon of feldspar depends upon the degree of heat to be supplied by the electrodes, a variation within certain limits being desirable according to the different degrees of heat, a larger quantity being used where a lower degree of heat is to be considered and a smaller quantity with respect to a relatively higher temperature.

The limit of variation in the proportion of feldspar is practically between 15 and 40 per cent. of the mixture and the undermentioned examples of the latter have been found to be effective.

For an electrode supplying a heat of say, 3000 degrees Fahr. it is advisable to use a protective coating such as would be pro- The function of the feldspar is to effect the required fusing between the coating and the electrode, the silica and silica sand actmg to produce a hardenin efiect and also to increase the resistance, w ile the solution of sodium silicate and sodium sulfate acts as a binder for the whole.

What I claim is as follows:

1. A protective coating for bodies subected to h gh temperatures, consisting of a mlxture comprising feldspar, silica 1n the form of crushed sharp-edged quartz, silica sand in its natural form and a binder, adapted to be applied to said bodies and causedto adhere thereto by the heating of said bodies.

2. A protective coating for bodies subected to high temperatures, consisting of a mixture comprising felds ar, silica, 1n the form of crushed sharp-edged quartz, silica sand in natural form and a solution of sodium silicate and sodium sulfate, adapted to be applied to said bodies and caused to adhere thereto by the heating of said bodies.

3. A- cement mixture comprising 15 to 40 per cent. of feldspar, silica in the form of crushed sharp-edged quartz, silica sand in 1ts natural form and a binder.

4. A protective coating for furnace electrodes consisting of a mixture comprising Boo'rH, a subject of the King of Great Brit- :3; aim, and resident of Montreal, Pr0V1 e 0f Feldspar 15 Quebec, Canada, have invented certa n new Silica 4O and useful Improvements in Cement f Silica sand 15 t'zuzz... ma shes- .1

feldspar, silica in the form of crushed sharp-edged quartz, silica sand in its natural form and a binder, the proportion of feldspar being {such as to insure a" fusing r action between the mixture and the electrode Witnesses: upon the heating of the latter. .1 w l. FRED GEAV, In testimony whereof, I have signedjiny f EV NS.

name to this specification, in the presence of two subscribing Witnesses:

HARVEY BZLBOOTH.

copies of this patent may be obtained for live cents eeqh, by addressing the Commissioner of Patents,

' wumii ta 'p. c." 

